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Substance Name: Pyrazoxone
RN: 108-34-9

Classification Codes

  • Agricultural Chemical
  • Insecticide
  • Out-Dated Pesticide

Molecular Formula

  • C8-H15-N2-O4-P

Molecular Weight

  • 234.191
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Names and Synonyms

Results Name

  • Pyrazoxone


  • 3-Methylpyrazolyl-5-diethylphosphate
  • AI3-24723
  • Diethyl 3-methyl-5-pyrazolyl phosphate
  • ENT 24,723
  • G-24483
  • Geigy G-24483
  • Methylpyrazolyl diethylphosphate
  • O,O-Diaethyl-O-(3-methyl-1H-pyrazol-5-yl)-phosphat
  • O,O-Diaethyl-O-(3-methyl-1H-pyrazol-5-yl)-phosphat [German]
  • O,O-Diethyl O-(3-methyl-5-pyrazolyl) phosphate
  • O,O-Diethyl-O-(3-methyl-1H-pyrazol-5-yl)-fosfaat
  • O,O-Diethyl-O-(3-methyl-1H-pyrazol-5-yl)-fosfaat [Dutch]
  • O,O-Dietil-O-(3-metil-1H-pirazol-5-il)-fosfato
  • O,O-Dietil-O-(3-metil-1H-pirazol-5-il)-fosfato [Italian]
  • Phosphate de diethyle et de 3-methyl-5-pyrazolyle
  • Phosphate de diethyle et de 3-methyl-5-pyrazolyle [French]
  • Phosphoric acid, diethyl-(3-methyl-5-pyrazolyl) ester
  • Phosphoric acid, diethyl-, 3-methylpyrazole-5-yl ester
  • Pirazoxon
  • Pirazoxon [Italian]
  • Pyrazol-3(or 5)-ol, 5(or 3)-methyl-, diethyl phosphate
  • Pyrazoxon
  • Pyrazoxone

Systematic Names

  • Phosphoric acid, diethyl 5(or 3)-methylpyrazole-3(or 5)-yl ester
  • Phosphoric acid, diethyl 5-methyl-1H-pyrazol-3-yl ester

Registry Numbers

CAS Registry Number

  • 108-34-9

System Generated Number

  • 0000108349

Structure Descriptors








Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
bird - wild LD50 oral 40mg/kg (40mg/kg)   Toxicology and Applied Pharmacology. Vol. 21, Pg. 315, 1972.
mouse LD50 oral 4mg/kg (4mg/kg)   Agricultural Research Service, USDA Information Memorandum. Vol. 20, Pg. 17, 1966.
rat LD50 subcutaneous 7mg/kg (7mg/kg)   Journal of Economic Entomology. Vol. 50, Pg. 356, 1957.

Physical Properties

Physical Property Value Units Temp (deg C) Source
log P (octanol-water) 0.760 (none)   EST
Water Solubility 1000 mg/L   EXP
Vapor Pressure 1.15E-05 mm Hg 25 EST
Henry's Law Constant 1.23E-10 atm-m3/mole 25 EST
Atmospheric OH Rate Constant 2.13E-10 cm3/molecule-sec 25 EST

Physical property data is provided to ChemIDplus by SRC, Inc.